Nope, their twitter is a tomb, they hardly post anything on it, no news on latest WRC or even the RBRC DLC for MGP13.
But I found out that their leading physical animator is now at Ubisoft that's why I can safely say the physics are more towards arcadey in MGP13 than the simey aspects that were in SBKGen.
I'm going to a head to head analysis on these somewhen.

Don't get why you get a dislike for this question but I think Steam would be a decent offer where you can get the pack and then just add it to the normal boxed version I think this worked for some for the Rookies DLC, too.
It would come just as an execution file that just literally integrates its content really just a folder with the stuff and a link in the menu to whatever game version you have it can be steam or boxed as the file paths are identical from what I know.